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Model-Based Control of Active Tilting-Pad Bearings

机译：基于模型的主动倾斜垫轴承控制

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摘要

A promising mechanical bearing candidate for an active operation is the tilting-pad bearing. The proposed active tilting-pad bearing has linear actuators that radially translate each pad/pivot pair. The use of feedback control in determining the actuator forces allows for the automatic, continuous adjustment of the pad position during the operation of the rotating machine. In this paper, we develop a nonlinear dynamic model of the active bearing system. The hydrodynamic force produced by the fluid film is modeled as a nonlinear, squeeze-film damper plus repellent spring. A model-based nonlinear controller is then designed to exponentially regulate the rotor position to the origin. A proof-of-concept experiment shows that the active strategy improves the bearing performance relative to its traditional passive operation. Further, the experiment demonstrates that the model-based nonlinear control regulates the rotor comparably to a linear proportional integral derivative (PID) control, but requires significantly less control energy.
机译：主动式轴承的理想选择是可倾瓦轴承。所提出的主动式可倾瓦轴承具有线性致动器，该线性致动器使每个瓦/枢轴对径向平移。在确定致动器力时使用反馈控制允许在旋转机器的操作期间自动，连续地调节垫的位置。在本文中，我们建立了主动轴承系统的非线性动力学模型。由流体膜产生的流体动力被建模为非线性挤压膜阻尼器和排斥弹簧。然后设计基于模型的非线性控制器，以指数方式将转子位置调节到原点。概念验证实验表明，相对于传统的被动操作，主动策略可以提高轴承性能。此外，实验证明，基于模型的非线性控制与线性比例积分微分（PID）控制相比，可调节转子，但是所需的控制能量明显更少。

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